Rodent Trapping and Control

Note: some rodents carry hantavirus, a potentially deadly infection that is transmitted when humans breathe in dust contaminated with the body fluids of infected rodents. If you will be cleaning up after a rodent infestation, read this important information first.

Trapping

Trapping rodents is a perfectly acceptable method of control. It should be done afterrodent prevention techniques and rodent proofing is completed. Trapping is especially desirable when rodenticides cannot be used near food, small children, or where domestic animals or livestock are present. Traps should be used indoors to prevent the serious odor and fly problems that can occur when poisoned rodents die in walls.

Before any trapping, first determine where rodents are entering structures or where rat activity is occurring.

Bait selection is important for trapping success. Peanut butter, nuts, bacon, pieces of apple, and moistened oatmeal are effective baits.

Place traps perpendicular to runways along fence tops and next to walls. Correct placement of snap traps is crucial to their effectiveness.

Pre-baiting traps is an important step. Rats tend to avoid new objects. Pre-baiting involves placing baited traps without setting them. This step allows rats and mice to become familiar with the traps. Place pre-baited traps in areas of rat activity for a few days.

After a few days, set baited traps perpendicular (at right angles) to active rat runways where droppings are seen. Follow manufacturer’s label instructions for setting traps. Before setting, securely attach bait to the trigger.

When the number of animals captured per day declines, check for fresh droppings. If droppings are still observed, the rodents may be avoiding the traps. Change trap location to new area of rat activity.

Repeat the cycle of pre-baiting and trapping until no new signs of rat activity are seen.

Some rodents can carry Hantavirus or other diseases. Therefore, when cleaning rodent areas, do not stir up dust by sweeping and vacuuming droppings, urine, or nesting material.

Using rubber or latex gloves, apply a disinfectant or a 10% bleach solution onto dead rodents and droppings. Clean up with paper towels. Double-bag and dispose of waste in a garbage can with a tight-fitting lid. Afterward, thoroughly wash hands with soap and water.

Information about rodents and disease can be obtained from the District laboratory at (650) 344-8592.